How the Thumbs-Up Shapes Viewer Trust
The like button sits right below every video, so the number is visible to everyone who watches. Since YouTube hides public dislike counts, likes have become the main visible sign of how viewers feel about a video. A healthy number reassures people that the content is worth their time and makes them more likely to keep watching. Likes are also one of several engagement signals creators track in YouTube Studio. They work best on videos that already deliver a clear promise from the title and thumbnail.